Perhaps you should try some spelling variations:
tham hoc » thai hoc, tham hoa, than hoc
su triet » su viet, su tien, ve triet
so sach » so sanh, bo sach, co sach
va tham » van tham, va cham, va thanh
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (v nang)) ma hoi. lieu va tham hoc ((va danh) OR (va hanh)) vi su triet~.
• Adding a wildcard symbol may retrieve word variants: so sach ((y nang) or (v nang)) ma hoi. lieu va tham hoc ((va danh) or (va hanh)) vi su triet*.